Webgui tutorials

Webgui examples.

Files
file	geom_threejs.cxx
	The tutorial demonstrates how three.js model for geometry can be created and displayed.
file	ping.cxx
	Test suite for RWebWindow communication performance.
file	web_cms.cxx
	Web-based geometry viewer for CMS geometry.
file	webpanel.cxx
	This macro demonstrates simple openui5 panel, shown with RWebWindow.
file	webwindow.cxx
	Minimal server/client code for working with RWebWindow class.